Roppen Tunnel, Imst (Austria)

New construction of the 2nd bore of the A12 Inn Valley motorway, parallel to the 1st bore. Length of 5,100 m, cross-section between 90 m2 and 120 m2.

  • Conventional cyclical drill and blast heading with immediate installation of supports and reinforcements.
  • Loose rock heading of around 400 m, in some sections using bore shield, partially with spiles and lattice girders.


Specific figures

Contract value

CHF 105 million

Construction period

2006 - 2010


5100 m

Total excavated surface

106 m2